Book/Report

FZJ-2016-02909

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Reinigung der Verbrennungsabgase bei der Wiederaufarbeitung von HTR-Brennelementen

Beaujean, H.FZJ* ; Filss, P.FZJ* ; Grahmann, U. ; Laser, M. ; Merz, E.FZJ* ; Tillessen, U.

1973
Kernforschungsanlage Jülich, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/11376

Report No.: Juel-0925-CT

Abstract: Experiments on the reprocessing of irradiated thorium-containing HTR fuel elements by the Burn-Leach process (the moderator is burned with oxygen) have been performed in the Hot Cells (HZ-2) of the Kernforschungsanlage Jülich. Results of experiments to purify the off-gases from shaft furnaces and fluidizedbed furnaces are summarized below. The condensable and particulate radioactive nuclides like cesium and zirconium released during the burning process were decontaminated by a factor of 10$^{7}$ by a series of conventional gas purification steps. Their concentrations in the off-gas were reduced to below the MPC values. The system, porous sintered metal filters in the burner followed by an electrostatic filter in the off-gas treatment plant, was demonstrated as an effective method for the separation of these aerosols. Tritium was removed (DF > 10$^{2}$) by molecular sieves or silica gel absorber traps. The release rate of Kr-85 was measured continuously during the burning process. Kr-85 was quantitatively released during the burning of (U,Th)C$_{2}$ fuels. Only about 7 % of the Kr-85 was released during burning of (U,Th)0$_{2}$ fuels irradiated to 10 % fifa. Off-gas concentrations of C-14 and thoron daughter-products were also determined. The design of a large-scale gas purification system for a nuclear fuel reprocessing plant is also discussed.

---

Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000 ; Retrocat)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

---

Database coverage:

---